105results about How to "Meet bandwidth requirements" patented technology

The invention discloses a protection method used for the link aggregation group of an Ethernet ring network and a device thereof; wherein, the method comprises the steps as follows: the state of the physical link in the link aggregation group is detected; when the failure state of certain physical link in the link aggregation group exists, the current wideband of the aggregation link group is compared with the inverse threshold value which meets the practical service requirement; furthermore, according to the comparison result, the subsequent processing is carried out; the protection method and the device thereof can meet the wideband requirement of the user.

This invention provides a network routing method used in providing optimum route for transmitting service flows between a source node and a destination note including: a, responding to a global routing request sent by the source note to find out at least one route meeting the request of bandwidth for transmitting service flows with the destination node, b, selecting a route with the optimum delay and stability in at least one route as the optimum route and c, preserving resources for the optimum route for transmitting service flows. This invention also provides a network routing device.

The invention discloses a broadband communication network architecture with a shared control and service network for a train. The architecture comprises a trusted network and an untrusted network, wherein the trusted network comprises a trusted vehicle-level network element arranged in each vehicle, and except for the trusted vehicle-level network elements, trusted train-level network elements are respectively arranged in the head train and the trail train; the untrusted network comprises untrusted train-level network elements respectively arranged in the head train and the trail train; one trusted train-level network element communicates with one untrusted train-level network element through a security gateway, and the security gateways are mutually redundant. The network architecture provided by the invention is the network architecture with the shared train control and service network for the train, transmission of the train control, monitoring and diagnosis information, passenger information and video information on the shared network and transmission of a passenger information service system network and a train network on the shared network are realized, so that the requirements for the network bandwidth of the passenger information service system network are met and the stability of the train network is guaranteed.

The invention discloses a network video monitoring system based on resolution ratio grading transmission, comprising a monitoring acquisition terminal and a monitoring center, wherein the monitoring acquisition terminal is used for transmitting acquired videos to the monitoring center through a network. The network video monitoring system is characterized in that the monitoring acquisition terminal comprises a high-definition video camera, an acquisition control unit and network access equipment, wherein the high-definition video camera is used for acquiring high-definition video information; and the acquisition control unit is used for carrying out digital compression coding on the high-definition video information acquired by the high-definition video camera, also outputting high-definition video streams and ordinary video streams and outputting the high-definition video streams or the ordinary video streams according to a control signalling or presetting sent by the monitoring center. The invention can acquire high-definition monitoring videos under an interesting scene without special requirements for the type, the bandwidth, and the like of the network and well solves the problem of contradiction between an acquired high-definition video monitoring image and limited network transmission bandwidth in the prior art.

The invention discloses an unmanned underwater photographing robot which comprises a submersible device and a relay device, wherein the submersible device comprises a first photographing device, a first laser communication device and a diving driving device; the relay device comprises a second laser communication device, a first wireless communication device and a relay driving device; the diving driving device is used for driving the submersible device to move; the first laser communication device is used for transmitting image data photographed by the first photographing device to the second laser communication device through the laser; the relay device is used for recognizing the submersible device; the relay driving device is used for driving the relay device to follow the submersible device according to a result of recognizing the submersible device, so that the second laser communication device can receive the image data transmitted by the first laser communication device; and the first wireless communication device is used for wirelessly transmitting the image data received by the second laser communication device to a control device. The unmanned underwater photographing robot can better photograph underwater and can supply a real-time video or image to a user.

The invention discloses a dynamic network resource reservation QoS guaranteeing method oriented to an industrial SDN. The method comprises a reserved resource application process, a reserved resource forwarding process and a reserved resource releasing process. A data packet with a designated Ethernet type is used for performing the negotiation of the resource reservation between a terminal device and a network, a network switch connected with the terminal intercepts the data packet of this type and sends the same to a controller; the controller reserves a bandwidth resource for the data flow according to the bandwidth and delay requirement of the data flow and the actual application condition of the network bandwidth, or releases the reserved bandwidth resource, and delivers the reserved resource result to the switch in a flow table sending way to be executed. The resource reservation / releasing process is flexibly controlled through a negotiation mechanism, and the supportability on the service data flow especially the period service data flow and the adaptability on the complicated communication state by the network can be improved.

The dual-band inverted-F antenna at least includes base plate with opposite first surface and second surface, first radiation microband wire formed on first surface of base plate, second radiation microband wire formed on first surface of base plate, feeder formed on first surface of base plate, said feeder is connected between first microband wire and second microband wire for feeding signal, connecting wire for simulataneously connecting with first microband wire and second microband wire and common metal short circuit rod for making first microband wire and second microband wire form shortcircuit and connect with ground.

The invention relates to a multi-channel video unicode rate control method, which comprises the following steps: collecting code statistics information, allocating multi-channel bit, allocating single-channel variable code rate bit, and calculating quantization parameter. The method not only can allocate bit to each channel according to the complexity of the video source image content, ensure that the final multiplexing bit stream of each channel, satisfy the requirement of the band width, reduce the difference of the video quality of each channel, and can ensure the stability of the mage quality inside the channel since each channel by adopting the variable code rate technology. In addition, the method is completely based on the feedback way, the analysis of the image complexity is basedon the statistics information produced during the coding process, so an additional image complexity analysis module is not required, and the cost can be reduced.

The invention discloses a wireless shore power video monitoring system, which comprises webcams, a video monitoring client and WI-FI (wireless fidelity) wireless transmitters, the webcams are arranged on mobile electric boxes, the video monitoring client can display the video images acquired by the webcams in real time, and the webcams carry out data interaction with the video monitoring client arranged in a dispatching and monitoring room via the WI-FI wireless transmitters. When the wireless shore power video monitoring system based on the Wi-Fi technology is adopted to monitor the shore power mobile electric boxes of a dock and give an alarm in real time, a dispatcher can accurately know the states of the mobile electric boxes in time at the rear, the remote and unattended monitoring of the shore power mobile electric boxes is realized, the difficulty of wiring wired video on the port dock is avoided, and moreover, the networking cost is low; the treatment and analysis of data are distributed to each webcam, the identification and treatment of digital images in video monitoring are fulfilled by embedded systems in the webcams, and thereby the burden of the video monitoring client in the dispatching and monitoring room is decreased.

The invention discloses a multi-mode antenna for satellite navigation. The integral multi-mode antenna is divided into a first layer, a second layer, a third layer, a fourth layer and a fifth layer which are sequentially arranged from top to bottom. The first layer is a radiating layer and is of a double-layer short-circuit patch structure, an upper-layer patch of the radiating layer is positioned on the top of a first layer of dielectrics, and a lower-layer patch is positioned at the bottom of the first layer of dielectrics and is connected with the upper-layer patch by a short-circuit arm; the second layer is a dielectric layer for supporting the radiating layer and is positioned between a feed probe and the lower-layer patch; the third layer is an L-shaped probe feed layer and comprises four L-shaped probes, a horizontal portion of the third layer is printed on a dielectric layer, and a perpendicular portion of the third layer penetrates through the dielectric layer to be connected with a secondary feed network; the fourth layer is a secondary dielectric strip-line feed network layer and comprises two broadband 90-degree phase shifters; the fifth layer is a primary dielectric strip-line feed network layer and comprises a broadband 180-degree phase shifter; and the fourth layer is connected with the fifth layer by a metal probe. The antenna has the advantages of good low-elevation axial ratio characteristic and high multi-path interference resistance.

The invention discloses an on-board non-registering multispectral image lossless / lossy encoding system and an on-board non-registering multispectral image lossless / lossy encoding method, and mainly solves problems of poor correlation between spectrums, inaccurate control of JPEG-LS (Joint Pho-tographic Experts Group-Lossless Standard) rate and low quality of image reconstruction caused by the fact that original on-board multispectral images are not registered in the prior art . The on-board non-registering multispectral image lossless / lossy encoding method includes: rearranging spectral segments of the non-registering multispectral images, registering each spectral segment of the multispectral images sequentially according to a sequence of optimal spectrum segment encoding, compressing the registered multispectral images in a lossless or lossy manner, selecting a prediction mode of a current encoding spectrum segment during lossy compressing, then performing JPEG-LS lossless compression on corresponding predicted residual, distributing object code rate of encoding spectrum segments during lossy compression, then selecting a prediction mode of current encoding spectrum segment to perform code-rate-controllable JPEG-LS lossless compression on corresponding predicted residual based on secondary iteration adjustment, and outputting code stream. The on-board non-registering multispectral image lossless / lossy encoding system and the on-board non-registering multispectral image lossless / lossy encoding method have the advantages of high compression performance and accurate rate control, and are applicable to various on-board multispectral data processing and transmission.

The invention discloses an enterprise-class ZigBee network seamless roaming method, which comprises the following steps of: dividing and configuring ZigBee networks in a range pre-covered by an enterprise-class wireless sensor network, setting corresponding device identification information for each network receiver and exciter of each ZigBee network, wherein the network configuration comprises the step of distributing a corresponding network identifier for each ZigBee network, and at least saving the network identifier for each ZigBee network and the device identification information of the network in an upper computer; uploading information including the device identification information of the exciter to the upper computer through a network convergence device of the original ZigBee network via a terminal label when the terminal label triggers the exciter; and receiving the information through the upper computer, and judging whether the ZigBee network where the exciter is positioned and the ZigBee network where the original terminal label is positioned are the same network, if not, performing network switching on the terminal label.

The embodiment of the invention discloses an information transmission implementation method, a module and a transmission network node. In the technical scheme of the embodiment of the invention, control information and / or management information to be transmitted are / is packaged into Ethernet service, and an Ethernet point-to-point protocol session is established between the transmission network nodes in order to simulate an Ethernet point-to-point link; based on the simulated Ethernet point-to-point link, the control information and / or the management information are / is transmitted between the nodes, consequently, the requirement of the transmission of the control information and / or the management information on bandwidth is met, meanwhile, the risk of communication interconnection between devices is reduced as well, and the requirement on reliability is met.

The invention disclose a double-notch ultra-wideband antenna, which comprises a dielectric substrate (1), a radiating element (2), a coplanar metal grounding plate (3), and a microstrip feeder (4), wherein double T-shaped filters (22, 23) are introduced onto the radiating element (2), rectangular complementary split-ring resonator (CSRR) structure grooves (31, 32) are formed in the grounding plate (3), the radiating element (2) is arranged on the upper middle part of the dielectric substrate (1), the microstrip feeder (4) is led to the radiating element (2) from the lower edge of the dielectric substrate (1) and is connected with the radiating element (2), and the grounding plate (3) is composed of two unfilled-corner rectangular metal plates which are positioned on two sides of the microstrip feeder (4) and equal in distances to the microstrip feeder (4). The double-notch ultra-wideband antenna adopts a coplanar waveguide feeding method, realizes ultra wideband by utilizing oval-like patches, and realizes notch features at the WiMAX (3.3-3.7GHz) and WLAN (5.15- 5.825GHz) frequency bands by utilizing the double T-shaped filters (22, 23), the grounding plate and the rectangular complementary split-ring resonator structure grooves. The double-notch ultra-wideband antenna can effectively reduce the mutual interference among the ultra-wideband system, the WLAN system and the WiMAX system, and realizes cooperative communication.

The invention discloses a linear automatic gain control amplifier for forward current detection in a PAM4 optical receiver. The amplifier comprises a high-speed signal transmission main path and a low-speed gain control circuit, wherein the high-speed signal transmission main path comprises a trans-impedance amplifier, a variable gain control amplifier, a bandwidth expansion circuit and an outputbuffer stage, and the low-speed gain control circuit comprises a received signal strength detector, a current comparator, a decoder, a control voltage generation module and the like. In order to improve the performance of the whole circuit, the variable gain amplifier adopted by the invention has good linearity and a larger dynamic range. Meanwhile, a bandwidth expansion circuit is additionally arranged between the variable gain amplifier and the output buffer stage, so the bandwidth of the whole cascade circuit is expanded. The whole circuit adopts a feedforward structure, and the input current of the trans-impedance amplifier is detected forwards to generate a corresponding gain control signal, so the response time is greatly reduced.

The invention relates to a power divider, belonging to the technical field of power dividers. The power divider comprises a shell, a powder dividing bar and a coupler, wherein the shell is internally provided with the powder dividing bar; two ends of the powder dividing bar are respectively connected with a contact pin of the coupler; the shell is connected with a shell of the coupler; the powder dividing bar is divided into two sections; and the two sections are connected with each other by a stud screw thread. By adopting a form of combining an air cavity and an internal conductor, the power divider not only meets the requirements for the coverage bandwidth and the power, but also guarantees the internal conductor not to be easily deformed and to have high fidelity and reduces the requirement on the processing accuracy in the production process, thus improving the production efficiency.

The invention provides a composite left and right hand transmission wire-based ultra small terminal antenna, comprising a copper clad microwave dielectric substrate, components formed on upper and lower surfaces of the microwave dielectric substrate trough etching copper foil; wherein, the microwave dielectric substrate is composite left and right hand material; the upper surface component comprises N upper radiating patches, with N as an natural number not less than 1; the lower surface component comprises a lower floor and a small-size lower connecting floor with an area less than that of the upper radiating patch; the lower floor and the small-size lower connecting floor are connected through a lower connecting line; the upper radiating patch is communicated to the small-size lower connecting floor through a shortcut needle; the quantity of the upper radiating patch is identical with that of the small-size lower connecting floor, or the quantities are different. The advantage is as follows: the small-size lower connecting floor connected to the lower floor is applied to replacing the former whole floor in the invention, so as to obtain the ultra small terminal antenna; the upper surface component is provided with the mode of connecting piece further, so as to enhance electromagnetic coupling of the connecting line with the upper radiating patch on coplanar wave guide, so as to enhance operation band width of the antenna.

This invention relates to a design for an inverse F type antenna including: a microwave base plate, a medium base, a radiation metallic sheet, a short circuit metallic sheet and a feed metallic sheet and the radiation metallic sheet also includes a connection metallic sheet, a first sub-radiation metallic sheet, a second sub-radiation metallic sheet, a third sub-radiation metallic sheet, a matched metallic sheet, slits, short circuit point and feed-in point, in which, the first sub-radiation metallic sheet is used in generating a first operation mode of the antenna, the second sub-radiation metallic sheet is used in generating a second operation mode of the antenna, the third sub-radiation metallic sheet is used in regulating the operational frequency and width of the second operation mode, the slits, the feed-in point and the short circuit point are used in regulating the impedance match and a notch is set at the earth side to increase the operation frequency width of the first operation mode.

The invention discloses a miniaturizedlinear polarization, dual polarization, circular polarization and triple polarization 5G antenna, which is characterized in that two orthogonal capacitive slits in transverse and longitudinal directions are formed in a Mushroom structure in a traditional metamaterial to form a novel electromagnetic metamaterial resonator structure, namely an annular resonator,so that a negative first-order resonance mode is excited; impedance, field distribution and radiation characteristics similar to those of a traditional positive first-order mode are achieved while miniaturization design is achieved. Through proper coupling feed excitation or other coaxial back feed and differential feed modes, miniature linear polarization, dual polarization, circular polarization and tri-polarization antenna design is realized, open-circuit microstrip line branches are connected in series on a floor back coupling feed line, and a new resonance mode is introduced, so that double resonance points appear in a band, the antenna bandwidth is effectively expanded, and the antenna performance is improved. And the bandwidth requirement of a 5G new frequency band is met. In addition, a standard system metal screw is adopted for supporting and a small number of dielectric substrates are adopted, so that dielectric loss is reduced as much as possible, and high radiation efficiency is kept.

The invention discloses a WiFi antenna applied to a metal frame mobile phone. The WiFi antenna applied to the metal frame mobile phone comprises a metal frame of the mobile phone, a 50 omega microstrip feeder, a metal strip band and a metal separating plate located in the middle layer of a body of the mobile phone, wherein a narrow seam is formed in the metal frame, one end of the metal strip band is connected with the 50 omega microstrip feeder, the other end of the metal strip band is connected with the metal frame at the position near the narrow seam of the metal frame, and the metal frame is electrically connected with the metal separating plate. The WiFi antenna applied to the metal frame mobile phone reasonably uses the metal frame of the mobile phone, takes the metal frame as part of an antenna radiation unit, controls the distribution of radiation current on the metal frame by additionally arranging the narrow seam in the metal frame, controls the current route of the antenna by the arrangement of the metal strip band, the metal frame and a grounded point, and changes the distribution of a radiation electricity field, thereby meeting the requirements for the work frequency band and bandwidth of the mobile phone antenna.

The invention provides a bandwidth control method, a bandwidth control device and a network bridge. The invention provides a bandwidth control method based on point-to-multipoint network bridge. The method comprises the following steps that: the beacon cycle with the scheduled length is divided into a distributed coordination function cycle and a point coordination function cycle; based on the scheduled unit bandwidth, the size of the scheduled unit pocket and the point coordination function cycle, minor time slice units comprising a plurality of minor time slices are judged; in the distribution type coordination function cycle, when a registration request message of terminal access equipment is received, the number of the minor time slice units distributed for the bandwidth is calculated according to the bandwidth of the thermal access equipment, and a mark comprising the terminal access equipment and the information item of the number of the minor time slice units are written in the current registration terminal list, and a registration response message is constructed and transmitted; in the point coordination function cycle, taking the minor time slices as a unit, according to the scheduled scheduling algorithm, the terminal access equipment indicated by the mark of the terminal access equipment of each information item in the current registration terminal list is polled.

The invention belongs to the technical field of integrated circuit designs, and particularly discloses a frequency self-tuning circuit of a trans-conductance capacitor (Gm-C). For the frequency self-tuning circuit, trans-conductance and capacitor arrays in a filter are separately taken out to form an integrator on the basis of an automatic amplitude-locking principle; by comparing the output of the integrator with the amplitude of a reference signal, a digital control bit is generated; the counting of a counter is controlled, and the capacitor arrays of the integrator and the filter are adjusted according to an output code word of the counter to ensure that the unit gain bandwidth of the integrator is the same as a reference frequency; and simultaneously, the cut-off frequency of the filter is tuned to be the same as the reference frequency. The method is simple and stable, has a wider tuning range compared with the prior method, has very low tuning power consumption by using a digital module, cannot influence the performance of the filter, and has very strong practical values.

The invention discloses a multispectral image compression system and method based on joint bit rate allocation and control, and mainly aims to solve the problems of instability of reconstruction quality and inaccuracy of JPEG-LS (joint photographic experts group-lossless standard) bit rate control caused by uneven bit rate allocation when multispectral images are allocated in the prior art. The method includes the implementing steps: performing KL (Karhunen-Love) conversion on a multispectral image to obtain converted components; performing data reconstitution on the converted components to obtain reconstituted components; and performing quantization step-size adjustment and quantization adjustment for the first time on all row data of the reconstituted components, performing iterative adjustment for the second time on quantified step size of last several rows, and performing quantization coding according to the quantified step size to obtain bit streams. By component data reconstitution and unified quantization step-size adjustment, bit rate allocation and bit rate control are combined and achieved, bit rate control precision is lower than target bit rate, reconstruction quality of spectral segments is uniform and stable, overall performance is optimal, and the method is suitable for various onboard multispectral image processing and transmission.

The invention discloses a rectangular microstrip patch antenna, which comprises an upper patch layer, a lower metal floor, and a medium substrate between the upper patch layer and the lower metal floor; and is characterized in that: specific patterns are etched on the metal floor; a whole etching area is positioned under a radiation patch of the upper patch layer and has an area corresponding to that of the radiation patch; the etched patterns are formed by periodically arraying basic planar elements in two orthogonal directions in the metal floor; and the basic planar elements have an embedded bending curve structure. In the antenna, the working frequency band of the antenna is effectively expanded; and a metal baffle is added below the metal floor for restraining the backward radiation of the antenna. The antenna has the advantages of capability of meeting the requirement of the bandwidth of the antenna in the field of wireless communication, no influence on other performance of theantenna, simple manufacturing process, convenient integration with other parts of the system, and relatively low processing expense.

This is a double frequency antenna in a shape of reversed F. It includes a premier radiation unit, a secondary radiation unit and a third radiation unit. The premier radiation unit includes a premier long and short line. The secondary radiation unit includes a secondary long and short line, with the secondary long line opposite to the premier short line. The third radiation unit includes a premier, secondary and third radiation sections, the last two sections are the prolonged parts to the two ends of the premier one, and with clearance between the premier and the third sections. The premier and the secondary sections meet to the premier frequency at IEEE 802.11b / g and the third section meets to the secondary frequency at IEEE 802.11a.

The invention discloses a matching circuit for an antenna of a Bluetooth headset and relates to the technical field of an electronic communication product. The matching circuit comprises a frequency band matching circuit arranged between a CPU(central processing unit) chip and the Bluetooth antenna of the Bluetooth headset, wherein the frequency band matching circuit comprises at least two frequency band matching circuits connected in parallel and acting on different frequency bands, the matching circuit for the antenna of the Bluetooth headset also comprises changeover switches for independently switching on the frequency band matching circuits respectively according to the signal receiving frequency or signal transmitting frequency of the Bluetooth headset, and the changeover switches are also connected with the control output end of the CPU chip and switch on the frequency band matching circuits in the corresponding frequency bands according to a signal of the control output end. The matching circuit for the antenna of the Bluetooth headset solves the technical problem that a Bluetooth antenna with small bandwidth in the prior art cannot meet the requirement on Bluetooth bandwidth. With the matching circuit, the Bluetooth antenna with small bandwidth can be applicable to the whole Bluetooth frequency band, and the overall performance of the Bluetooth headset is improved.

The invention discloses an allocation and selection method and system of distributed relay servers in NAT traversal. A relay server state database and a network topology database which are identical logically are maintained in the system, a client hoping to obtain a care-of address can send an allocation request to any relay server, the optimal relay server matched with the client can be selected from the relay servers according to the relay server state database and the network topology database, and the client can be informed through an alternative server attribute. In addition, when two client sides are both located behind symmetrical NATs and different relay servers are allocated to the client sides, one side belonging to a controlling side selects the optimal care-of address through a network detection mode and informs a controlled side. According to the allocation and selection method and system, flow relay service requirements under the circumference that lots of users are located behind address dependent type NATs or address and port dependent type NATs can be met, using of server resources and network bandwidth resources can be optimized, delaying of end-to-end transmission is reduced, and performance of end-to-end transmission is improved.

The invention provides a high-function circular buffer and cache system and a control method thereof. The system comprises a transfer management module, and a content related management module and a content storage which are in two-way circuit connection with the transfer management module respectively, wherein a DMA engine module and a host control interface are also in two-way circuit external connection with the transfer management module. The system enables the bit information of TRB to be cached in a local buffer zone in a compact way, the DMA engine does not need to obtain the TRB of each data packet about to move in the main memory, the chip is available to memory access directly, and the information required by DMA can be obtained in a shorter period; the system meets the requirements on USB3.0 bandwidth, is small and compact in volume, not only reduces power consumption and chip area, but also is more beneficial to the wiring of the back-end of the chip.

The invention relates to a distributed-type massage processing system architecture and a massage processing method. The system architecture comprises a first line card, a second line card, a third line card and a switching network; the ingress massage processing method in the method comprises that ingress massages received by the first line card are processed completely by an ASIC (application specific integrated circuit) chip; ingress massages received by the second line card and the third line card are processed completely or partially by the local NP (neutral point) chip, and the part which is not processed by the NP chip is processed by the local ASIC chip; and the engress massage processing method comprises: engress massages received by the first line card and the second line card are processed completely by the ASIC chip; and engress massages received by the third line card are processed completely or partially by the local ASIC chip, and the part which is not processed by the ASIC chip is processed by the local NP chip. The system architecture and the method provided by the invention are simple and efficient.

The embodiment of the invention discloses a parallel system bus architecture, which comprises a master control board and at least two service boards. In the downlink direction, the master control board and the service boards are in point-to-point connection with each other through a bus; and in the uplink direction, the master control board and the service boards are in multipoint-to-single-point connection with each other through the bus. The downlink direction refers to link from the master control board to the service boards, and the uplink direction refers to link from the service boards to the master control board. Accordingly, the embodiment of the invention also discloses a port configuration management method in the parallel system bus architecture. By implementing the parallel system bus architecture and the port configuration management method thereof, the user bandwidth requirement is satisfied by adopting uplink / downlink asymmetric bus architecture, so as to reduce the wire outgoing pressure of the master control board and the back board and reduce the number of gathered chip pins.